期刊
POLYHEDRON
卷 170, 期 -, 页码 783-787出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2019.06.028
关键词
Uranyl; Reductive silylation; Redox-active ligands; Metal-oxo; Oxygen-18
资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Heavy Element Chemistry Program [DE-SC0008479]
- U.S. Department of Energy (DOE) [DE-SC0008479] Funding Source: U.S. Department of Energy (DOE)
Stoichiometric silylation of the uranyl species, ((dipp)isq)(2)UO2THF, which features two reduced iminosemiquinone ligands, is reported. These ligand radicals facilitate the reduction of uranium 6+ to 4+, which is accompanied by silylation of the uranyl moiety with two equivalents of Me 3 SiBr and release of the oxidized ligand. The intermediate, (Me3SiO)(2)UBr2(OPPh3)(2), is isolated prior to U-O bond cleavage by further addition of Me3SiBr, producing UBr4(OPPh3)(2). U-O bond scission can also be performed in a one-pot reaction, by treating (((dipp)isq)(2)UO2THF with Me2SiCl2, forming UCl4(OPPh3)(2) and polymeric silyl products, (O=SiMe2)(n), with concomitant loss of oxidized ligand. In each case, isotopic O-18 labeling experiments highlight the incorporation of the uranyl oxygen atoms into the resulting siloxanes released in the reactions. (C) 2019 Elsevier Ltd. All rights reserved.
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